/*
 * TextServices / TSDotNet / TSNative
 * Marco Maria Bellocchi, Mauro Bampo
 * Copyright(c) 2013.
 * 
 * The MIT License
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * 
 */

// MB 25/01/2013: Created

#pragma once
#include "stdafx.h"
#include "Encoder.h"

using namespace TSNative::Filters;

namespace TSNative {
	
	namespace Services {

		enum CsvCompressorOptions { None = 0x0, EnableRle = 0x01, EnableCharToNibble = 0x02, EnableBinToAlphabet = 0x04, EnableAllStages = 0xFF };

		/// Implements an encoder that compresses CSV numeric strings for use as text in SQL databases.
		/// In order to have consistent results, strings must only contain digits and '+', '-', '.', ',' characters.
		class AlphabetCsvCompressor : public Encoder {
		
		public:

			static const char CHAR_TO_NIBBLE_DICTIONARY[16];
			/// Used to map binary characters to allowed SQL characters in latin collation.
			static const char BIN_TO_LATIN1_DICTIONARY[256];
			/// Used to map SQL characters in latin collation back to the binary characters they came from.
			static const char LATIN1_TO_BIN_DICTIONARY[256];

			AlphabetCsvCompressor(CsvCompressorOptions options = EnableAllStages);
			virtual ~AlphabetCsvCompressor();
		
		};

	}

}